Down to the Green
Down to the green means being all in: your chips are gone from the felt.
The simple explanation
The expression describes a player who has put all their chips in the pot, so nothing remains in front of them but the green felt of the table. It is used in live poker when a player has gone all in.
A closer look
The phrase is informal. It is a picture of the table surface being visible where the chips used to be. Players use it as a more colorful way to say all in.
A practical example
A player pushes his last chips forward and says he is down to the green.
Full explanation
Down to the green means being all in: your chips are gone from the felt.
Down to the green is slang for being all in. The green refers to the table felt where the player’s chips used to be.
The phrase suits live games, where the felt is visible when a stack is gone.
It is related to felted, which describes losing your whole stack.